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Evolution of dynamic shear strength of frictional interfaces during rapid normal stress variations

Rubino, Vito and Tal, Yuval and Rosakis, Ares J. and Lapusta, Nadia (2021) Evolution of dynamic shear strength of frictional interfaces during rapid normal stress variations. EPJ Web of Conferences, 250 . Art. No. 01016. ISSN 2100-014X. doi:10.1051/epjconf/202125001016.

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Pressure shear plate impact tests have revealed that when normal stress changes rapidly enough, the frictional shear resistance is no longer proportional to the normal stress but rather evolves with slip gradually. Motivated by these findings, we focus on characterizing the dynamic shear strength of frictional interfaces subject to rapid variations in normal stress. To study this problem, we use laboratory experiments featuring dynamic shear cracks interacting with a free surface and resulting in pronounced and rapid normal stress variations. As dynamic cracks tend to propagate close to the wave speeds of the material, capturing their behavior poses the metrological challenge of resolving displacements on the order of microns over timescales microseconds. Here we present our novel approach to quantify the full-field behavior of dynamic shear ruptures and the evolution of friction during sudden variations in normal stress, based on ultrahighspeed photography (at 1-2 million frames/sec) combined with digital image correlation. Our measurements allow us to capture the evolution of dynamic shear cracks during these short transients and enable us to decode the nature of dynamic friction.

Item Type:Article
Related URLs:
URLURL TypeDescription
Rubino, Vito0000-0002-4023-8668
Tal, Yuval0000-0001-7308-9294
Rosakis, Ares J.0000-0003-0559-0794
Lapusta, Nadia0000-0001-6558-0323
Additional Information:© The Authors, published by EDP Sciences, 2021. This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. We acknowledge the following sources of support: NSF (Grant EAR- 1651235), US Geological Survey (USGS) (Grant G20AP00037), Caltech/ Mechanical and Civil Engineering Big Idea Fund (2019), Caltech’s Division of Geological and Planetary Sciences, and the Southern California Earthquake Center (SCEC) (Contribution 19093). SCEC is funded by NSF Cooperative Agreement EAR-1033462 and USGS Cooperative Agreement G12AC20038.
Funding AgencyGrant Number
Caltech Big Ideas FundUNSPECIFIED
Caltech Division of Geological and Planetary SciencesUNSPECIFIED
Southern California Earthquake Center (SCEC)UNSPECIFIED
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Other Numbering System NameOther Numbering System ID
Southern California Earthquake Center (SCEC)19093
Record Number:CaltechAUTHORS:20211006-161417119
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Official Citation:Evolution of dynamic shear strength of frictional interfaces during rapid normal stress variations. Vito Rubino, Yuval Tal, Ares J. Rosakis and Nadia Lapusta. EPJ Web Conf., 250 (2021) 01016; DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:111238
Deposited By: Tony Diaz
Deposited On:06 Oct 2021 16:30
Last Modified:06 Oct 2021 16:30

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